/Engine/Source/Runtime/Engine/Classes/Kismet/KismetSystemLibrary.h
Unloads a primary asset, which allows it to be garbage collected if nothing else is referencing it
static void UnloadPrimaryAssetList ( const [TArray](API\Runtime\Core\Containers\TArray)< [FPrimaryAssetId](API\Runtime\CoreUObject\UObject\FPrimaryAssetId) > & PrimaryAssetIdList )